Could it of been implantation bleeding?

Patient

Q: I have tested positive for pregnancy and am yet to find out how many weeks. I've not had any implantation bleeding that I know of although.. January 5th I began bleeding, cramps, heavy ish flow but only 3 days. I originally thought this was a period l, is there a chance this could of been the implantation bleeding and infact could be more weeks than I first thought?

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